adapt README

adapt README

README.md

@@ -7,8 +7,8 @@
 
 ![count](https://media.giphy.com/media/3owzW5c1tPq63MPmWk/giphy.gif)
 
-Tiny CLI tool to find out how many chia plots will still fit on your hard disk. In other word to say: 
-How many chia plots do I have left on my hard disk. The tool will work fine on all unix systems (unix, linux, macos)
+Tiny CLI tool to find out how many chia plots will still fit on your hard disk. In other words to say: 
+How many chia plots do I have left on my hard disk. The tool will work fine on all unix based systems (unix, linux, macos)
 
 ## Getting started
 
@@ -37,7 +37,38 @@ Now you are ready to go.
 
 ### Usage
 
-...
+```bash
+# find out how many chia plots will still fit on /path/to/plots
+> plots-left /path/to/plots
+```
+
+To specify the amount of plots to reserve use `--reserve` or `-r`
+```bash
+# find out how many chia plots will still fit on /path/to/plots
+# reserve 1 chia plot
+> plots-left -r 1 /path/to/plots
+```
+Call with `--help` or `-h` to see the help page
+```bash
+> plots-left -h
+
+NAME:
+   plots-left - find out how many plots will still fit on your hard disk
+
+USAGE:
+   plots-left [-r RESERVE] PATH
+   plots-left -r 1 /plots/nas1
+
+DESCRIPTION:
+   Tool will perform the following calculation (AVAILABLE_DISK_SPACE/SINGLE_PLOT_SIZE)-RESERVED_PLOTS.
+
+GLOBAL OPTIONS:
+   --reserve RESERVE, -r RESERVE  RESERVE. the amount of plots to reserve. (default: 0)
+   --help, -h                     show help (default: false)
+
+COPYRIGHT:
+   GNU GPLv3
+```
 
 ## Kind gestures